US20090105723A1 - Steerable stone basket - Google Patents
Steerable stone basket Download PDFInfo
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- US20090105723A1 US20090105723A1 US12/213,265 US21326508A US2009105723A1 US 20090105723 A1 US20090105723 A1 US 20090105723A1 US 21326508 A US21326508 A US 21326508A US 2009105723 A1 US2009105723 A1 US 2009105723A1
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- legs
- mesh portion
- elongate member
- basket
- medical device
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/22—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
- A61B17/221—Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/22—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
- A61B17/221—Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions
- A61B2017/2212—Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions having a closed distal end, e.g. a loop
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49995—Shaping one-piece blank by removing material
- Y10T29/49996—Successive distinct removal operations
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- Health & Medical Sciences (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Vascular Medicine (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Medical Informatics (AREA)
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- Animal Behavior & Ethology (AREA)
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- Veterinary Medicine (AREA)
- Surgical Instruments (AREA)
Abstract
A medical device includes a sheath defining a lumen, a first elongate member, and a second elongate member. The first and second elongate members are movably disposed within the lumen. The medical device further includes a basket comprising a plurality of legs and a mesh portion. A proximal end of each leg of the plurality of legs is connected to the first elongate member, and a proximal end of the mesh portion is connected to the second elongate member.
Description
- This application claims the benefit of U.S. Provisional Patent Application No. 60/960,950 filed Oct. 22, 2007, the complete disclosure of which is incorporated by reference herein.
- This disclosure relates generally to a medical device and, more particularly, to retrieval devices having steerable baskets and methods of manufacturing and using the same.
- Extractors have been used for the removal of stones, calculi, and other foreign matter from within the body. One type of extractor has a sheath and includes a basket at its distal end. The basket may be collapsed within the sheath to achieve a reduced diameter profile. The basket also may be opened when it extends beyond the sheath. Once opened, a targeted stone may be captured within the basket. The baskets of such extractors may include wires that are joined via soldering or welding to form a tip at a distal end of the basket. The wires may be joined to an elongate member at a proximal end of the basket, and the elongate member may be moveable relative to the sheath in order to expand and collapse the basket. Manufacturing such devices, however, can be costly and time consuming. In addition, it may be difficult to capture a targeted stone within such a basket without pushing the stone deeper into the body cavity in which the stone is located. It also may be difficult to capture small stone fragments formed when the targeted stone is broken up through processes such as laser lithotripsy.
- The present disclosure provides retrieval devices and methods of manufacturing and using the same that avoid some or all of the aforementioned shortcomings of existing devices.
- In an exemplary embodiment of the present disclosure, a medical device includes a sheath defining a lumen, a first elongate member, and a second elongate member. The first and second elongate members are movably disposed within the lumen. The medical device further includes a basket comprising a plurality of legs and a mesh portion. A proximal end of each leg of the plurality of legs is connected to the first elongate member, and a proximal end of the mesh portion is connected to the second elongate member.
- In accordance with certain embodiments of the present disclosure, the device may include one or more of the following features. For example, the basket is formed from a single piece of a material. In such an embodiment, the plurality of legs is formed by removing portions of the single piece of material, and the mesh portion is formed by removing portions of the single piece of material. The mesh portion comprises a plurality of slots formed by removing portions of the single piece of material, and the single piece of material comprises a shape memory material and a cannula.
- In other exemplary embodiments, the basket further includes an atraumatic tip, and the first elongate member is moveable independent of the second elongate member. In such embodiments, movement of the first elongate member actuates the plurality of legs independent of the mesh portion, and movement of the second elongate member actuates the mesh portion independent of the plurality of legs. In addition, the plurality of legs comprises two legs, and the plurality of legs and the first elongate member are formed from a single piece of material. In such embodiments, the mesh portion is formed from the single piece of material. A distal end of each of the plurality of legs is connected to a distal end of the mesh portion, and the proximal end of each of the plurality of legs is not connected to the proximal end of the mesh portion.
- In further exemplary embodiments, the plurality of legs has a legs expanded position in which the plurality of legs is disposed substantially outside of the lumen and a legs collapsed position in which the plurality of legs is disposed substantially within the lumen, and wherein the mesh portion has a mesh expanded position in which the mesh portion is disposed substantially outside of the lumen and a mesh collapsed position in which the mesh portion is disposed substantially within the lumen. In such embodiments, the mesh portion is configured to maintain the mesh collapsed position while the plurality of legs is in the legs expanded position. In addition, the plurality of legs is configured to maintain the legs collapsed position while the mesh portion is in the mesh expanded position, at least a portion of the plurality of legs is distal the mesh when the plurality of legs is in the legs expanded position, and at least a portion of the mesh portion is distal the plurality of legs when the mesh portion is in the mesh expanded position.
- In another exemplary embodiment of the present disclosure, a medical retrieval device basket includes a plurality of legs and a mesh portion disposed substantially opposite the plurality of legs. The plurality of legs and the mesh portion are formed from a single piece of material, and the plurality of legs is moveable independent of the mesh portion.
- In accordance with certain embodiments of the present disclosure, the device basket may include one or more of the following features. For example, the plurality of legs is formed by removing portions of the single piece of material, and the mesh portion is formed by removing portions of the single piece of material. The mesh portion comprises a plurality of slots formed by removing portions of the single piece of material, and the single piece of material comprises a shape memory material and a cannula. The basket further includes an atraumatic tip. In other exemplary embodiments, each of the plurality of legs is connected to a first elongate member, and the mesh portion is connected to a second elongate member.
- In a further exemplary embodiment of the present disclosure, a method of manufacturing a medical device basket includes removing first portions of a piece of material to form a plurality of legs and removing second portions of the piece of material to form a mesh portion disposed substantially opposite the plurality of legs.
- In accordance with certain embodiments of the present disclosure, the method may include one or more of the following features. For example, removing first portions of the piece of material and removing second portions of the piece of material includes one of laser cutting, chemical etching, die cutting, and mechanically slicing. In addition, the first portions and the second portions are substantially longitudinal portions, and the plurality of legs comprises two legs. In other exemplary embodiments, the method further includes connecting each leg of the plurality of legs to a first elongate member, connecting the mesh portion to a second elongate member, and forming an atraumatic tip at a distal end of the basket.
- In still another exemplary embodiment of the present disclosure, a method of removing matter from the body of a patient includes providing a medical device including a sheath defining a lumen, a first elongate member and a second elongate member, the first and second elongate members being movably disposed within the lumen, and a basket comprising a plurality of legs and a mesh portion, a proximal end of each leg of the plurality of legs being connected to the first elongate member, and a proximal end of the mesh portion being connected to the second elongate member. The method further includes advancing the medical device to a treatment site within the body of the patient, capturing the matter within the basket of the device, and removing the medical device from the body of the patient.
- In accordance with certain embodiments of the present disclosure, the method may include one or more of the following features. For example, in certain embodiments, capturing the matter further includes advancing the first elongate member in a distal direction. In such an embodiment, advancing the first elongate member includes at least partially extending the plurality of legs substantially outside of the lumen while maintaining the mesh portion substantially within the lumen. Advancing the first elongate member also includes forming a substantially open basket with the plurality of legs distal to the stone. Capturing the matter also includes advancing the device in the distal direction once the elongate member has been advanced, and advancing the second elongate member in the distal direction.
- In another exemplary embodiment, advancing the second elongate member includes at least partially extending the mesh portion substantially outside of the lumen while maintaining at least a portion of the plurality of legs outside of the lumen. In such an embodiment, advancing the second elongate member also includes substantially encircling the stone with the mesh portion, and capturing the matter further includes partially retracting the first elongate member in a proximal direction.
- In still another exemplary embodiment, capturing the matter further includes forming a backstop with the mesh portion. The method also includes reducing the size of the matter and sweeping at least a portion of the matter from the treatment site with the mesh portion.
- It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only, and are not restrictive of the invention as claimed.
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FIG. 1 is a partial cross-sectional view of a retrieval device according to an exemplary embodiment of the present disclosure. -
FIG. 2 illustrates an alternate configuration of the device ofFIG. 1 . -
FIG. 3 a illustrates another configuration of the device ofFIG. 1 . -
FIG. 3 b illustrates still another configuration of the device ofFIG. 1 . -
FIG. 4 is a side view of a portion of an unformed basket of the device ofFIG. 1 . - Exemplary embodiments of the present disclosure are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
- In an exemplary embodiment of the present disclosure, a retrieval device includes a plurality of legs and a mesh portion. The legs and the mesh portion are independently moveable, and together, the legs and mesh portion form an asymmetric steerable basket at a distal end of the retrieval device useful for capturing and removing matter, such as a stone, from within the body of a patient. The legs may be configured to extend from a distal end of a sheath of the retrieval device while the mesh portion remains within a lumen of the sheath. Thus, the legs may move distal the mesh portion and may form a substantially open basket face proximal the targeted stone. The legs and/or the retrieval device may be manipulated so as to at least partially capture the stone within the substantially open basket without forcing the stone further into the body cavity in which it is located. Once the stone is at least partially captured, the mesh portion may be deployed from the distal end of the sheath to encircle the stone and, in some embodiments, the legs may be at least partially retracted. Once the legs are partially retracted, at least a portion of the mesh portion may extend distal the legs. The mesh portion may be used as, for example, a backstop during stone fragmentation and/or reduction processes. The mesh portion may also be used to sweep, for example, stone fragments from the body of the patient after such processes.
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FIG. 1 illustrates aretrieval device 2 according to an exemplary embodiment of the present disclosure. Thedevice 2 includes abasket 4, a firstelongate member 6, and a secondelongate member 7. Thedevice 2 further includes asheath 10 defining alumen 12, and the first and secondelongate members lumen 12. Relative movement between the first and secondelongate members sheath 10 assists thebasket 4 in forming an expanded position (shown inFIG. 1 ), where thebasket 4 is disposed beyond adistal end 8 of thesheath 10, and a retracted position (shown inFIG. 2 ), where thebasket 4 is disposed within thelumen 12 of thesheath 10. - The
basket 4 may include a plurality oflegs 22. The plurality oflegs 22 may include any number of legs useful in immobilizing, capturing, and/or retrieving a targetedstone 34, calculi, or other foreign matter. As shown inFIG. 1 , in an exemplary embodiment, the plurality oflegs 22 may include two legs. Because, as will be described below, the portion of thebasket 4 havinglegs 22 may be used to initially encircle thestone 34, it is preferred to minimize the number oflegs 22 in at least certain embodiments. - The
proximal end 28 of each leg of the plurality oflegs 22 may be connected to a distal end of the firstelongate member 6 in any conventional way. Alternatively, the plurality oflegs 22 may be formed of the same piece of material as the firstelongate member 6. - The
basket 4 may also include amesh portion 23 disposed substantially opposite the plurality oflegs 22. Themesh portion 23 may define a plurality of openings, orifices, orslots 25. As described above with respect to the plurality oflegs 22, themesh portion 23 may be useful in immobilizing, capturing, and/or retrieving the targetedstone 34, and the plurality ofslots 25 may be sized, angled, and/or otherwise configured to permit, for example, fluids to pass through thebasket 4 while retaining a capturedstone 34. Theproximal end 29 of themesh portion 23 may be connected to a distal end of the secondelongate member 7 in any conventional way. Alternatively, themesh portion 23 may be formed of the same piece of material as the secondelongate member 7. In an exemplary embodiment, the plurality oflegs 22 and themesh portion 23 may be formed of the same piece of material. In such an embodiment, one or both of the first and secondelongate members - The
basket 4 may further include anatraumatic tip 24. Theatraumatic tip 24 may be disposed at a distal end of thebasket 4, and theatraumatic tip 24 may be connected to thedistal end 26 of each of the plurality oflegs 22 and thedistal end 31 of themesh portion 23. Theatraumatic tip 24 may have any atraumatic configuration known in the art. For example, theatraumatic tip 24 may be a filled, crimped, and/or cappeddistal end 26 of the plurality oflegs 22. Alternatively, theatraumatic tip 24 may be a filled, crimped, and/or cappeddistal end 31 of themesh portion 23. - The
device 2 also may include ahandle 14 configured to assist in transitioning thebasket 4 between the expanded position and the retracted position. Thehandle 14 may include, for example, afirst slide 16, asecond slide 17, and/or other conventional mechanisms configured to assist in manipulating the position of thebasket 4. In an exemplary embodiment, moving the first andsecond slides distal end 20 of the handle 14 (in the distal direction of arrow 21) may move the first and secondelongate members basket 4 in a distal direction relative to thehandle 14 and, thus, may assist in transitioning thebasket 4 to the expanded position shown inFIG. 1 . In such an embodiment, moving the first andsecond slides proximal end 18 of the handle 14 (in the proximal direction of arrow 19) may move the first and secondelongate members basket 4 in a proximal direction relative to thehandle 14 and, thus, may assist in transitioning thebasket 4 to the retracted position shown inFIG. 2 . In this exemplary embodiment, thesheath 10 may remain stationary with respect to thehandle 14. As will be explained below, the first andsecond slides elongate members legs 22 independent of themesh portion 23, and manipulate themesh portion 23 independent of the plurality oflegs 22. In such an embodiment, thebasket 4 may be desirably steerable, and thedevice 2 may be used to capture a targetedstone 34 within the body of a patient. - Each of the first and second
elongate members elongate members elongate members elongate members elongate members elongate members legs 22, themesh portion 23, and/or one or both of the first and secondelongate members elongate members - The overall length and diameter of the first and second
elongate members elongate members 6, 7 (and therefore a relatively long device 2) may be advantageous for retrieving stones or other calculi deep within the body of the patient. In addition, first and secondelongate members elongate members - The
sheath 10 may be formed from any of the materials discussed above with respect to the first and secondelongate members FIGS. 1-3 illustrate asheath 10 having asingle lumen 12, in additional exemplary embodiments of the present disclosure, thesheath 10 may define more than onelumen 12. The additional lumen may be used for insertion of a lithotripsy device or other therapeutic or diagnostic device, or for irrigation or suction, for example. Thesheath 10 may be dimensioned to fully enclose the first and secondelongate members basket 4 when thebasket 4 is in the retracted position shown inFIG. 2 . - As illustrated in
FIG. 4 , the plurality oflegs 22 and/or themesh portion 23 of thebasket 4 may be formed by, for example, laser cutting, chemical etching, die cutting, or mechanically slicing a single piece ofmaterial 38.FIG. 4 shows a flat piece ofmaterials 38 having a number of cuts, openings, and/or slots therein.Material 38 may be rolled, twisted, or otherwise formed into thefinal basket 4. The single piece ofmaterial 38 may be the same piece of material as the first and secondelongate members material 38 may be a substantially hollow, substantially cylindrical wire, rod, tube, hypotube, cannula, stent, or other piece of biocompatible material connected to the first and secondelongate members - The
material 38 may be cut in, for example, a longitudinal direction to define the plurality oflegs 22. For example, cut 22′ defines the opening between the plurality oflegs 22 andcuts 22″ define the space between the plurality oflegs 22 and themesh portion 23. The width of the cuts may define the width and mechanical behavior of each leg of the plurality oflegs 22, and the desired width may vary depending on the particular application. For example, it may be advantageous to have relatively narrow basket legs when retrieving a relativelylarge stone 34 from a body structure. The length of the longitudinal cuts may define the length and mechanical behavior of the plurality oflegs 22, and the desired length may vary depending on the particular application. Each leg of the plurality oflegs 22 may have the same length and width, or the length and width of eachleg 22 may vary depending on the particular application. In addition, the spacing between the plurality oflegs 22 may vary or may be consistent. - The
material 38 may be cut in, for example, a longitudinal direction, a transverse direction, a V-shape, a wave-shape, a saw-shape, and/or any other shape or direction to define themesh portion 23. The cuts may form the plurality ofslots 25. As illustrated in the Figures, theslots 25 may extend substantially longitudinally along thebasket 4. Alternatively, theslots 25 may extend at any angle relative to a longitudinal axis (not shown) of thebasket 4. The number, size, and configuration of theslots 25 may correspond to the desired porosity of themesh portion 23. For example, amesh portion 23 having relatively long, wide, and/ornumerous slots 25 may be more porous than amesh portion 23 having relatively short, narrow, and/orfew slots 25. - The plurality of
legs 22 and/or themesh portion 23 may be, for example, cold worked or heat processed to form a shape in memory. The shape of the plurality oflegs 22 and/or themesh portion 23 may be fully formed once the first and secondelongate members basket 4 is allowed to fully expand (as shown, for example, inFIG. 1 ). Alternatively, the shape may be partially formed when thebasket 4 is partially expanded (as shown, for example, inFIGS. 3 a and 3 b). The resultingbasket 4 may be any shape useful in capturing and/or retrieving astone 34 or other calculi or foreign matter, and may be sized so as to be capable of capturing astone 34 in the range of approximately 4 mm to approximately 10 mm along its largest dimension.Such baskets 4 may be, for example, substantially spherical or substantially lemon shaped. - The
mesh portion 23 may be any webbing, netting, or other like structure. The structure is preferably porous, but may be nonporous. The material 38 (FIG. 4 ) of the structure may be, for example, nitinol, stainless steel, polyvinylethylene (“PVE”), polyvinyl alcohol (“PVA”), ePTFE, PTFE, foam, rubber, plastic, polyurethane, or any other, metal, polymer, or composite known in the art. The structure may allow, for example, fluid or other material to pass through while prohibiting, for example, stones from escaping thebasket 4. If not formed of the same piece of material as the legs, the structure may be attached to the plurality oflegs 22 through welding, grafting, tying, or any other attachment method known in the art. - The plurality of
legs 22 and/or themesh portion 23 of thebasket 4 may also be coated with a sheet of protection material (not shown) to protect the plurality oflegs 22 and/or themesh portion 23 during processes such as, for example, laser lithotripsy. The configuration, material, and other characteristics of thebasket 4 described herein permit thebasket 4 to assume a contracted, collapsed state within thesheath 10 for delivery to a treatment site, and an expanded state for use at the treatment site. - At least some aspects of the present disclosure may be used, for example, to retrieve a
stone 34, calculus, or other material from any location within the body, such as, for example, in the urinary tract of the patient. Thedevice 2 may be inserted through the urethra of the patient or, alternatively, thedevice 2 may be inserted percutaneously to a treatment site. The treatment site within the body may correspond to the location of a targetedstone 34. - The
stone 34 targeted for retrieval may be a kidney stone, a struvite, a uric acid stone, a cystine stone, or other solid deposit commonly removed from a body structure or passageway within the body.Such stones 34 may contain various combinations of chemicals, including, but not limited to, calcium, oxalate, and phosphate. Thestone 34 may be of any size and could have a length or diameter of approximately 1 mm to 12 mm. These lengths and diameters are merely exemplary, and aspects of the present disclosure may assist in the retrieval of stones larger or smaller than those discussed herein.Stones 34 may be of any shape and could be, for example, flat, round, smooth, or jagged. Thedevice 2 may retrievestones 34 that are both impacted and free floating. - The
device 2 may be advanced to the treatment site through an access sheath (not shown), stent, or other access or dilatation device known in the art. In addition, thedevice 2 may be used in conjunction with an endoscope (not shown) or other type of intracorporeal scope known in the art. The endoscope may advance through the body over a guidewire to the treatment site. Alternatively, the endoscope may be independently fed to the treatment site without the use of a guidewire. Once the treatment site has been reached, thedevice 2 may be fed through an access port of the endoscope to gain access to thestone 34. - While being advanced to the treatment site, the
basket 4 of thedevice 2 may be at least partially, and preferably fully, enclosed within thesheath 10. This configuration (shown inFIG. 2 ) may minimize the size of thedevice 2 and may assist in advancing thedevice 2 through the endoscope. Upon exiting the endoscope and accessing thestone 34, the user may extend at least a portion of thebasket 4 from thedistal end 8 of thesheath 10. In an exemplary embodiment, the user may move thefirst slide 16 in the distal direction ofarrow 21, thereby moving the firstelongate member 6 in the distal direction of arrow 21 (as shown inFIG. 3 a). Such movement may force at least a portion of the plurality oflegs 22 to exit thedistal end 8 of thesheath 10. This presents a substantially open distal, or front, face of thebasket 4 to thestone 34. The user may manipulate thedevice 2, such as pushing thedevice 2 distally, such that the plurality oflegs 22 may at least partially capture thestone 34 as shown inFIG. 3 b. Themesh portion 23 may remain fully or at least partially within thesheath 10 while the plurality oflegs 22 is extended. As mentioned above, using only the plurality oflegs 22 to partially capture thestone 34 may enable the user to surround thestone 34 with a partially formed and substantially open-endedbasket 4. Using the substantially open-ended basket configuration ofFIGS. 3 a and 3 b may also enable the user to avoid pushing thestone 34 out of reach of thebasket 4 while thebasket 4 is transitioned from the collapsed position to the expanded position. Thus, unlike existing baskets, the exemplary asymmetricsteerable baskets 4 of the present disclosure do not require the user to maneuver theatraumatic tip 24 of thebasket 4 distal thestone 34 prior to capturing thestone 34. This is advantageous because such maneuvering may be difficult, if not impossible, in narrow body passages. In addition, in maneuvering the tip of a basket distal a stone prior to capturing the stone, the user may inadvertently push the stone further into the body passage in which it is located, thereby making it more difficult to remove the stone. Theexemplary baskets 4 of the present disclosure avoid at least some of these disadvantages. - Once the
stone 34 is at least partially captured by the plurality oflegs 22, the user may move thesecond slide 17 in the direction ofarrow 21, thereby moving the secondelongate member 7 in the distal direction of arrow 21 (as shown inFIG. 1 ). Such movement may force at least a portion of themesh portion 23 to exit thedistal end 8 of thesheath 10 to encircle thestone 34 and/or substantially fully capture thestone 34 within thebasket 4. The user may also partially retract thefirst slide 16 and firstelongate member 6 by moving the first slide 16 i,n the proximal direction of arrow 19 (as shown inFIG. 1 ). Such movement may assist the user in capturing and/or immobilizing thestone 34 once themesh portion 23 has been fully deployed. Once captured, thestone 34 may be retrieved by removing thedevice 2 from the body of the patient. - If, however, the targeted
stone 34 is larger than approximately 3 mm, thestone 34 may be too large to be safely removed from the body. In these situations, the user may use thedevice 2 to capture and assist in immobilizing thestone 34. The user may then perform a stone-reduction process, such as, for example, laser lithotripsy, to break up or otherwise reduce the size of thestone 34. Thebasket 4, and in particular, themesh portion 23, may act as a backstop during such a process and may assist in preventing particles of thestone 34 from migrating or escaping from the treatment site during or after the stone-reduction process. In such a process, a laser fiber 36 (FIG. 1 ) or other conventional device may be used to break up thestone 34. Thelaser fiber 36 may be fed through an access port of an endoscope and may be activated and controlled by the user to reduce the size of thestone 34 or to fragment it into smaller pieces. Once thestone 34 has been fragmented, themesh portion 23 may substantially immobilize the stone fragments and stop them from passing further distally. As shown inFIG. 1 , at least partially retracting the plurality oflegs 22 may cause themesh portion 23 to more fully surround thestone 34 to assist in substantially immobilizing the fragments. Moreover, once thestone 34 has been fragmented, themesh portion 23 may act as, for example, a net or sweeping device to sweep stones and stone particles obtained from the reduction process out of the body. - Alternatively, the user may decide to release the
stone 34 after thestone 34 has been captured. In such a situation, the user may move the firstelongate member 6, and consequently, the plurality oflegs 22, in the direction ofarrow 21. With the plurality oflegs 22 substantially fully extended in the distal direction, the user may at least partially retract themesh portion 23 by moving the secondelongate member 7 in the direction ofarrow 19. Manipulating the first and secondelongate members basket 4. The user may then move theentire device 2 in the direction ofarrow 19 such that the capturedstone 34 may be easily released. Because, for example, theatraumatic tip 24 will not interfere with the position of thestone 34 as thestone 34 is released from thebasket 4, it may be safer and/or easier to release a capturedstone 34 from thebaskets 4 of the present disclosure than from other known baskets. - Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. For example, the first and second
elongate members sheath 10 may include a plurality of flexibility features configured to increase the flexibility of thedevice 2. The flexibility features may be formed by removing a portion of the first and secondelongate members sheath 10. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.
Claims (46)
1. A medical device, comprising:
a sheath defining a lumen;
a first elongate member and a second elongate member, the first and second elongate members being movably disposed within the lumen; and
a basket comprising a plurality of legs and a mesh portion, a proximal end of each leg of the plurality of legs being connected to the first elongate member, and a proximal end of the mesh portion being connected to the second elongate member.
2. The medical device of claim 1 , wherein the basket is formed from a single piece of a material.
3. The medical device of claim 2 , wherein the plurality of legs is formed by removing portions of the single piece of material, and the mesh portion is formed by removing portions of the single piece of material.
4. The medical device of claim 2 , wherein the mesh portion comprises a plurality of slots formed by removing portions of the single piece of material.
5. The medical device of claim 2 , wherein the single piece of material comprises a shape memory material.
6. The medical device of claim 2 , wherein the single piece of material comprises a cannula.
7. The medical device of claim 1 , wherein the basket further includes an atraumatic tip.
8. The medical device of claim 1 , wherein the first elongate member is moveable independent of the second elongate member.
9. The medical device of claim 8 , wherein movement of the first elongate member actuates the plurality of legs independent of the mesh portion.
10. The medical device of claim 8 , wherein movement of the second elongate member actuates the mesh portion independent of the plurality of legs.
11. The medical device of claim 1 , wherein the plurality of legs comprises two legs.
12. The medical device of claim 1 , wherein the plurality of legs and the first elongate member are formed from a single piece of material.
13. The medical device of claim 12 , wherein the mesh portion is formed from the single piece of material.
14. The medical device of claim 1 , wherein a distal end of each of the plurality of legs is connected to a distal end of the mesh portion.
15. The medical device of claim 1 , wherein the proximal end of each of the plurality of legs is not connected to the proximal end of the mesh portion.
16. The medical device of claim 1 , wherein the plurality of legs has a legs expanded position in which the plurality of legs is disposed substantially outside of the lumen and a legs collapsed position in which the plurality of legs is disposed substantially within the lumen, and wherein the mesh portion has a mesh expanded position in which the mesh portion is disposed substantially outside of the lumen and a mesh collapsed position in which the mesh portion is disposed substantially within the lumen.
17. The medical device of claim 16 , wherein the mesh portion is configured to maintain the mesh collapsed position while the plurality of legs is in the legs expanded position.
18. The medical device of claim 16 , wherein the plurality of legs is configured to maintain the legs collapsed position while the mesh portion is in the mesh expanded position.
19. The medical device of claim 16 , wherein at least a portion of the plurality of legs is distal the mesh when the plurality of legs is in the legs expanded position.
20. The medical device of claim 16 , wherein at least a portion of the mesh portion is distal the plurality of legs when the mesh portion is in the mesh expanded position.
21. A medical retrieval device basket, comprising:
a plurality of legs; and
a mesh portion disposed substantially opposite the plurality of legs, the plurality of legs and the mesh portion being formed from a single piece of material, the plurality of legs being moveable independent of the mesh portion.
22. The basket of claim 21 , wherein the plurality of legs is formed by removing portions of the single piece of material, and the mesh portion is formed by removing portions of the single piece of material.
23. The basket of claim 21 , wherein the mesh portion comprises a plurality of slots formed by removing portions of the single piece of material.
24. The basket of claim 21 , wherein the single piece of material comprises a shape memory material.
25. The basket of claim 21 , wherein the single piece of material comprises a cannula.
26. The basket of claim 21 , wherein the basket further includes an atraumatic tip.
27. The basket of claim 21 , wherein each of the plurality of legs is connected to a first elongate member, and the mesh portion is connected to a second elongate member.
28. A method of manufacturing a medical device basket, comprising:
removing first portions of a piece of material to form a plurality of legs; and
removing second portions of the piece of material to form a mesh portion disposed substantially opposite the plurality of legs.
29. The method of claim 28 , wherein removing first portions of the piece of material and removing second portions of the piece of material includes one of laser cutting, chemical etching, die cutting, and mechanically slicing.
30. The method of claim 28 , wherein the first portions and the second portions are substantially longitudinal portions.
31. The method of claim 28 , wherein the plurality of legs comprises two legs.
32. The method of claim 28 , further including connecting each leg of the plurality of legs to a first elongate member.
33. The method of claim 28 , further including connecting the mesh portion to a second elongate member.
34. The method of claim 28 , further including forming an atraumatic tip at a distal end of the basket.
35. A method of removing matter from the body of a patient, comprising:
providing a medical device including:
a sheath defining a lumen,
a first elongate member and a second elongate member, the first and second elongate members being movably disposed within the lumen, and
a basket comprising a plurality of legs and a mesh portion, a proximal end of each leg of the plurality of legs being connected to the first elongate member, and a proximal end of the mesh portion being connected to the second elongate member;
advancing the medical device to a treatment site within the body of the patient;
capturing the matter within the basket of the device; and
removing the medical device from the body of the patient.
36. The method of claim 35 , wherein capturing the matter includes advancing the first elongate member in a distal direction.
37. The method of claim 36 , wherein advancing the first elongate member includes at least partially extending the plurality of legs substantially outside of the lumen while maintaining the mesh portion substantially within the lumen.
38. The method of claim 36 , wherein advancing the first elongate member includes forming a substantially open basket with the plurality of legs distal to the matter.
39. The method of claim 36 , wherein capturing the matter includes advancing the device in the distal direction once the first elongate member has been advanced.
40. The method of claim 36 , wherein capturing the matter further includes advancing the second elongate member in the distal direction.
41. The method of claim 40 , wherein advancing the second elongate member includes at least partially extending the mesh portion substantially outside of the lumen while maintaining at least a portion of the plurality of legs outside of the lumen.
42. The method of claim 40 , wherein advancing the second elongate member includes substantially encircling the stone with the mesh portion.
43. The method of claim 40 , wherein capturing the matter further includes partially retracting the first elongate member in a proximal direction.
44. The method of claim 43 , wherein capturing the matter further includes forming a backstop with the mesh portion.
45. The method of claim 44 , further including reducing the size of the matter.
46. The method of claim 45 , further including sweeping at least a portion of the matter from the treatment site with the mesh portion.
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US12/213,265 US8328819B2 (en) | 2007-10-22 | 2008-06-17 | Steerable stone basket |
PCT/US2008/067452 WO2009055098A1 (en) | 2007-10-22 | 2008-06-19 | Steerable stone basket |
US13/670,241 US8939992B2 (en) | 2007-10-22 | 2012-11-06 | Steerable stone basket |
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US96095007P | 2007-10-22 | 2007-10-22 | |
US12/213,265 US8328819B2 (en) | 2007-10-22 | 2008-06-17 | Steerable stone basket |
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US13/670,241 Continuation US8939992B2 (en) | 2007-10-22 | 2012-11-06 | Steerable stone basket |
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US8328819B2 US8328819B2 (en) | 2012-12-11 |
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US13/670,241 Active US8939992B2 (en) | 2007-10-22 | 2012-11-06 | Steerable stone basket |
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US13/670,241 Active US8939992B2 (en) | 2007-10-22 | 2012-11-06 | Steerable stone basket |
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Also Published As
Publication number | Publication date |
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US8328819B2 (en) | 2012-12-11 |
WO2009055098A1 (en) | 2009-04-30 |
US8939992B2 (en) | 2015-01-27 |
US20130066330A1 (en) | 2013-03-14 |
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